Boiler



Sept. 24, 1935.- L. J. MITCHELL Er AL BOILER Filed May 5, 1934 L. J Mieke!! JA. larislz M www Fllg.

Patented Sept. 24, 1935 `UNITED STATES itATENT GFFICE BOILER Application May 3, 1934, Serial No. 723,698

6 Claims.

bined heat units and deectors positioned around the exterior of a boiler and Within a surrounding jacket.

An object of the improvement is to provide a jacket spaced around a boiler with heating means thereunder, and to provide upwardly and inwardly inclined deflectors'upon the exterior of the boiler, so constructed and arranged that all of the heat is deected away from the jacket and against the exterior of the boiler, the deflectors also serving as heat units which conduct the heat to the outer wall of the boiler.

Another object is to locate the deflectors in vertically spaced tiers, so that the heat is successively deflected against the boiler at different points throughout its height.

A further object of the invention is to locate the several tiers of heat deflectors in staggered relation to each other so as to produce a maXimum of heating effect.

The above, together with other objects which will be apparent from the drawing and following description, or which may be later pointed out may be attained by constructing the invention in the manner illustrated in the accompanying drawing, in which Figure 1 is a vertical sectional view of a boiler embodying the invention;

Fig. 2, a transverse section through the boiler, above one of the tiers of deflectors, taken as on the line 2 2, Fig. l; Fig. 3, a detached perspective view, on a larger scale, of one of the improved dleectors land heat units; and

Fig. 4, a similar View of a special form of deilector designed for use at the upper end of the boiler.

Similar numerals refer to similar parts throughout the drawing.

In the drawing is illustrated a type of steam boiler especially adapted for producing steam for pressing machines such as are used in cleaning and pressing establishments, tailor shops and the like, although it should be understood that this is merely for the purpose of illustrating the invention which in its broadest aspect is applicable to any type of steam boiler.

The boiler includes the cylindric wall lil formed of boiler plate lapped at one side as at I l and the joint closed as by the rivets l2 heads I3 and il! respectively being connected to the upper and lower ends of the cylindric side wall as by the rivets I5.

A pipe IB may communicate With the lower portion of the boiler forsupplying water thereto and clean-out openings ll may be provided, normally closed as by the plugs i8. Steam from the boiler is conveyed to the pressing machine or other apparatus to be operated thereby as by a pipe I9 communicating with the upper portion of the boiler anda return pipe 2li for carrying condensation back to the boiler communicates with the lower portion thereof. Y

The boiler may be supported spaced above the oor or other horizontal surface indicated at 2| as by a stand comprising a ring 22 having depending legs 23 and inwardly disposed lugs 24 upon which the lower end of the boiler rests.

A cylindric jacket 25 provided with a lining 26 of asbestos or the like surrounds and is spaced from the boiler, said jacket being supported upon the stand which carries the boiler. The upper end of the jacket may be provided with a head 2l having a central opening 21a,` to which may be connected a flue or pipe leading to a chimney so as to carry 01T the products of combustion.

A gas burner which may be of the horseshoe burner type is indicated at 28 and may be supported beneath the boiler as by the lugs 29 formed upon the ring portion 22 of the stand. The usual drain plug 3i! may be provided in the lower head of the boiler.

The improved deflector and heat conducting unit to .which the invention pertains may be of the form shown in detail in Fig. 3 and may be l cast or otherwise formed of suitable metal. This deflector includes the arcuate upwardly and inwardly inclined and tapered outer wall 3| and the upwardly inclined and tapered end walls 32.

These deflectors may be connected to the exterior of the cylindric Wall l0 of the boiler in juxtaposition and located in vertically spaced tiers as shown in Fig. 1. The inner edges 33 of the side walls of the deflectors may be welded as indicated at 33a, or otherwise attached to the outer surface of the cylindric portion l0 of the boiler.

When thus connected to the boiler it will be seen that the lower edge of the outer wall 3l of each deilector contacts with the inner surface of the asbestos lining 26 while the upper edge thereof is spaced considerably therefrom so as to cause all of the products of combustion to be deflected upward and inward against the outer surface of the boiler. The deflectors in successive tiers are preferably staggered relative to adjacent tiers as shown in Figs. l. and 2 so as to cause a considerable amount of the heat passing up from each lower tier to impinge the end walls 32 of the deilectors in the next upper tier, heating the same so that the heat therefrom is conducted to the cylindric wall I of the boiler. The de- 5 ectors are thus combined deflectors and heat conducting units whereby they convey the maximum amount of heat to the boiler.

If desired, a slightly different form of dei-lector may be provided at the upper end portion of the boiler. One of this type deector is shown detached in Fig. 4 and it will be seen that the same is considerably shorter than the delector shown in Fig. 3 and may, if desired, be of heavier construction as shown. Each of these deectors comprises the outer curved portion 34 adapted to contact with the asbestos lining 26 of the jacket, as shown in Fig. l, and the angular end members 35, the inner ends 36 of which may be welded or otherwise connected to the cylindric portion l0 of the boiler.

In the operation of the invention, all of the heat from the burner 28 passes up between the boiler and the jacket and through the several tiers of deflectors and heat units, being repeatedly deilected inward against the surface of the boiler While the end portions of the deflectors being iixed to the boiler, will conduct heat directly to the boiler as these deectors and heat units become heated. The spent products of combus- 30 "tion will pass out at the upper end of the jacket through the discharge outlet 21a to the chimney flue.

In actual operation the invention has been found very eiicient, the deflectors concentrating the heat directly against the water area of the boiler instead of passing straight out to the chimney. Any quality of steam may be produced with the boiler, as desired, either moist steam for garment pressing machines and the flike, or dry hot steam for heating or other purposes, by providing the necessary number of deflectors and heat units on the boiler. It has been found by actual practice that under normal conditions, in a boiler connected to the cylinder of `a pressing machine, sixty-five pounds of steam can be generated in twenty minutes using approximately twenty cubic feet of gas. It has also been found that the boiler alone will generate sixty-five pounds of steam in ten minutes, using only approximately ten cubic feet of gas. The

cost of operation and upkeep of the boiler is reduced tc a minimum as it is not necessary to replace flues, thus eliminating service charges and leaking ues and there is no place for scale, soot Yor mud to collect to cause trouble.

We claim:

1. In combination with a boiler, a jacket spaced from and surrounding the boiler, heating means at one end of the jacket and a gas discharge outlet at the other end of the jacket, deflectors hav- 5 ing angular end portions attached to the boiler and angular outer portions contacting at their lower edges with the jacket for directing all of the gases against the boiler.

2. In combination with a boiler, a jacket spaced l0 from and surrounding the boiler, heating means at one end of the jacket and a gas discharge outlet at the other end of the jacket, deectors having angular end portions welded to the boiler and angular outer portions contacting at their lower 15 edges with the jacket for directing all of the gases against the boiler.

3. In combination with a boiler, a jacket spaced from and surrounding the boiler, heating means at one end of the jacket and a gas discharge out- 2o let at the other end of the jacket, deflectors having angular end portions attached to the boiler and upwardly and inwardly inclined outer portions contacting at their lower edges with the jacket for directing all of the gases against the 25 boiler.

4. In combination with a boiler, a jacket spaced from and surrounding the boiler, heating means at one end of the jacket and a gas discharge outlet at the other end of the jacket, deilectors hav- 30 l ing angular end portions attached to the boiler and upwardly and inwardly tapered outer portions contacting at their lower edges with the jacket for directing all of the gases against the boiler. 35

5. In combination with a boiler, a jacket spaced from and surrounding the boiler, heating means at one end of the jacket and a gas discharge outlet at the other end of the jacket, deflectors having angular end portions attached to the boiler 40 and upwardly and inwardly tapered and inclined outer portions contacting at their lower edges with the jacket for directing all of the gases against the boiler.

6. In combination with a boiler, a jacket spaced 45 from and surrounding the boiler, heating means at one end of the jacket and a gas discharge outlet at the other end of the jacket, staggered, spaced tiers of deiie'ctors having angular end portions attached to the boiler and angular outer 50 portions contacting at their lower edges with the jacket for directing all of the gases against the boiler.

` LEWIS J. MITCHELL.

JOHN A. MORRISON. 55 

